.NetCore简单使用Mvc内置的Ioc

public class DemoService
 {
 public string Test()
 {
  return Guid.NewGuid().ToString();
 }
 }

public class DemoController : Controller
 {
 private readonly DemoService _demoService;

 public DemoController(DemoService demoService)
 {
  _demoService = demoService;
 }

 public IActionResult Index()
 {
  return Json(_demoService.Test());
 }
 }

//方法一
 services.AddSingleton(typeof(DemoService), new DemoService());

 //方法二
 services.AddSingleton(typeof(DemoService));

//方法三
 services.AddSingleton();

//范例
 services.AddTransient(typeof(DemoService));
 services.AddScoped();

public interface IDemo2Service
 {
 string Test();
 }

public class Demo2Service : IDemo2Service
 {
 public string Test()
 {
  return Guid.NewGuid().ToString();
 }
 }

public class Demo2Controller : Controller
 {
 private readonly IDemo2Service _demoService;

 public Demo2Controller(IDemo2Service demoService)
 {
  _demoService = demoService;
 }

 public IActionResult Index()
 {
  return Json(_demoService.Test());
 }
 }

 //方法一
 services.AddSingleton(typeof(IDemo2Service), new Demo2Service());

//方法二
 services.AddSingleton(typeof(IDemo2Service), typeof(Demo2Service));

 //方法三
 services.AddSingleton();

 public interface IServiceSupport
 {
 }

public interface IDemo3Service
 {
 string Test();
 }

public class Demo3Service : IDemo3Service
 {
 public string Test()
 {
  return Guid.NewGuid().ToString();
 }
 }

 private static void AddSingletonServices(IServiceCollection services)
 {
  var asm = Assembly.Load(new AssemblyName("IocCoreDemo.Services"));
  var serviceTypes = asm.GetTypes()
  .Where(x => typeof(IServiceSupport).IsAssignableFrom(x) && !x.GetTypeInfo().IsAbstract);

  foreach (var serviceType in serviceTypes)
  {
  foreach (var serviceInterface in serviceType.GetInterfaces())
  {
   services.AddSingleton(serviceInterface, serviceType);
  }
  }
 }

using IocCoreDemo.Services;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using System.Linq;
using System.Reflection;